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Let's open up a file to create isosurfaces
Check all of the variables and click apply
Change the plot type to surface and change the color mapping to hardyglobal
Let's open the color legend by clicking the button on the top left corner
To create isosurfaces, apply a contour filter
The isosurface does not have any color
Check Compute Scalars and change the color mapping to hardyglobal
You can see that the color corresponds to the value that you selected
Change the value to 2 and add two more values of 3 and 4
Notice the change in the plot
You can also add ranges by clicking New Range
Let's create 6 isosurfaces between 2 and 4.6
Notice how it creates the values for you
Click apply. Now there are 6 isosurfaces on the plot
You can also color the plot by the gradient values of hardyglobal
Click on Compute Gradients and change the color mapping to Gradients
This is how to create isosurfaces in ParaView.